PBIRS September 2026 update error - Attempted to read or write protected memory

Trying to update a PBIRS installation from January 2026 to September 2026 and getting an error during the update. The setup log contains the following message:

Something went wrong, please find details in setup logs.CallStack:

Unhandled Exception: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

at System.Management.IWbemServices.DeleteInstance_(String strObjectPath, Int32 lFlags, IWbemContext pCtx, IntPtr ppCallResult)

at System.Management.ManagementObject.Delete(DeleteOptions options)

at Microsoft.BIServer.SetupUtils.WmiUtil.RemoveWmiRegistration(String instanceName)

at Microsoft.BIServer.Setup.SetupPrepareStep.Install()

at SetupEngine.Install()

at SetupEngine.Execute()

at Microsoft.BIServer.Setup.Setup.Main(String cmdLine)

This is occurring on more than one server. Any clues?